NCERT Class X Science Class: Chapter –2. Acids, Bases and Salts – Part-5

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Question 25:

Match the chemical substances given in Column (A) with their appropriate application given in Column (B)

Chemical Substances
chemical substances

Column (A)

Column (B)

A.

Bleaching powder

i.

Preparation of glass

B.

Baking soda

ii.

Production of

C.

Washing soda

iii.

Decolourisation

D.

Sodium chloride

iv.

Antacid

  1. A—(ii), B—(i), C—(iv), D—(iii)

  2. A—(iii), B—(ii), C—(iv), D—(i)

  3. A—(iii), B—(iv), C—(i), D—(ii)

  4. A—(ii), B—(iv), C—(i), D—(iii)

Answer: C

Question 26:

Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use colour guide given in Figure.)

Image the PH scale

Image the PH Scale

Image the PH scale

  1. Red

  2. Yellow

  3. Yellowish green

  4. Blue

Answer: C

Image the Yellowish green

Image the Yellowish Green

Image the Yellowish green

Question 27:

Which of the following is/are true when is passed through water?

  1. It does not ionize in the solution as it is a covalent compound.

  2. It ionizes in the solution

  3. It gives both hydrogen and hydroxyl ion in the solution

  4. It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule

  5. (i) only

  6. (iii) only

  7. (ii) and (iv)

  8. (iii) and (iv)

Answer: C

Though gas is a covalent compound, in the aqueous solution it ionizes to form ions.

Image HCl gas

Image HCl Gas

Image HCl gas

Question 28:

Which of the following statements is true for acids?

  1. Bitter and change red litmus to blue

  2. Sour and change red litmus to blue

  3. Sour and change blue litmus to red

  4. Bitter and change blue litmus to red

Answer: C

Image Sour and change blue litmus to red

Image Sour and Change Blue Litmus to Red

Image Sour and change blue litmus to red

Question 29:

Which of the following are present in a dilute aqueous solution of hydrochloric acid?

Answer: A

Image dilute aqueous solution of hydrochloric acid

Image Dilute Aqueous Solution of Hydrochloric Acid

Image dilute aqueous solution of hydrochloric acid

Question 30:

Identify the correct representation of reaction occurring during chloralkali process

Answer: D

Image reaction occurring during chloralkali process

Image Reaction Occurring During Chloralkali Process

Image reaction occurring during chloralkali process

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